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drm/imx: imx-ldb: Add DDC support

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Add support for reading EDID over Display Data Channel. If no DDC
adapter is available, falls back to hardcoded EDID or display-timings
node as before.

Signed-off-by: Steve Longerbeam <steve_longerbeam@mentor.com>
Signed-off-by: Akshay Bhat <akshay.bhat@timesys.com>
Acked-by: Philipp Zabel <p.zabel@pengutronix.de>
Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
This commit is contained in:
Steve Longerbeam 2016-04-27 16:23:33 -04:00 committed by Philipp Zabel
parent 1a695a905c
commit a6d206e28a
1 changed files with 34 additions and 8 deletions
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42
drivers/gpu/drm/imx/imx-ldb.c
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@ -59,6 +59,7 @@ struct imx_ldb_channel {
struct drm_encoder encoder;
struct drm_panel *panel;
struct device_node *child;
struct i2c_adapter *ddc;
int chno;
void *edid;
int edid_len;
@ -107,6 +108,9 @@ static int imx_ldb_connector_get_modes(struct drm_connector *connector)
return num_modes;
}
if (!imx_ldb_ch->edid && imx_ldb_ch->ddc)
imx_ldb_ch->edid = drm_get_edid(connector, imx_ldb_ch->ddc);
if (imx_ldb_ch->edid) {
drm_mode_connector_update_edid_property(connector,
imx_ldb_ch->edid);
@ -553,6 +557,7 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
for_each_child_of_node(np, child) {
struct imx_ldb_channel *channel;
struct device_node *ddc_node;
struct device_node *port;
ret = of_property_read_u32(child, "reg", &i);
@ -595,14 +600,34 @@ static int imx_ldb_bind(struct device *dev, struct device *master, void *data)
}
}
edidp = of_get_property(child, "edid", &channel->edid_len);
if (edidp) {
channel->edid = kmemdup(edidp, channel->edid_len,
GFP_KERNEL);
} else if (!channel->panel) {
ret = of_get_drm_display_mode(child, &channel->mode, 0);
if (!ret)
channel->mode_valid = 1;
ddc_node = of_parse_phandle(child, "ddc-i2c-bus", 0);
if (ddc_node) {
channel->ddc = of_find_i2c_adapter_by_node(ddc_node);
of_node_put(ddc_node);
if (!channel->ddc) {
dev_warn(dev, "failed to get ddc i2c adapter\n");
return -EPROBE_DEFER;
}
}
if (!channel->ddc) {
/* if no DDC available, fallback to hardcoded EDID */
dev_dbg(dev, "no ddc available\n");
edidp = of_get_property(child, "edid",
&channel->edid_len);
if (edidp) {
channel->edid = kmemdup(edidp,
channel->edid_len,
GFP_KERNEL);
} else if (!channel->panel) {
/* fallback to display-timings node */
ret = of_get_drm_display_mode(child,
&channel->mode,
0);
if (!ret)
channel->mode_valid = 1;
}
}
channel->bus_format = of_get_bus_format(dev, child);
@ -647,6 +672,7 @@ static void imx_ldb_unbind(struct device *dev, struct device *master,
channel->encoder.funcs->destroy(&channel->encoder);
kfree(channel->edid);
i2c_put_adapter(channel->ddc);
}
}